/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --indigo-50: #eef2ff;
  --indigo-100: #e0e7ff;
  --indigo-200: #c7d2fe;
  --indigo-300: #a5b4fc;
  --indigo-400: #818cf8;
  --indigo-500: #6366f1;
  --indigo-600: #4f46e5;
  --indigo-700: #4338ca;
  --indigo-800: #3730a3;
  --indigo-900: #312e81;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --amber-50: #fffbeb;
  --amber-200: #fde68a;
  --amber-700: #b45309;
  --green-50: #f0fdf4;
  --green-200: #bbf7d0;
  --green-700: #15803d;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.06), 0 1px 3px rgba(0,0,0,.1);
  --shadow-md: 0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.06);
  --shadow-lg: 0 10px 15px rgba(0,0,0,.1), 0 4px 6px rgba(0,0,0,.05);
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', Menlo, Consolas, monospace;
  --max-w: 1200px;
  --transition: .2s ease;
}

html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  color: var(--gray-800);
  background: var(--gray-50);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--indigo-600); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }

.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  background: var(--indigo-700);
  color: #fff;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  z-index: 100;
  font-size: .875rem;
}
.skip-link:focus { top: 8px; }

/* ===== Header ===== */
.site-header {
  background: #fff;
  border-bottom: 1px solid var(--gray-200);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: var(--shadow-sm);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  gap: 16px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--gray-900);
  font-weight: 700;
  font-size: 1rem;
  text-decoration: none;
  flex-shrink: 0;
}
.logo:hover { text-decoration: none; }
.logo-icon { flex-shrink: 0; }
.main-nav {
  display: flex;
  gap: 4px;
  align-items: center;
}
.main-nav a {
  color: var(--gray-600);
  font-size: .875rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
}
.main-nav a:hover,
.main-nav a:focus-visible {
  background: var(--indigo-50);
  color: var(--indigo-700);
  text-decoration: none;
}

/* ===== Hero ===== */
.hero {
  background: linear-gradient(135deg, var(--indigo-700) 0%, var(--indigo-600) 50%, #7c3aed 100%);
  color: #fff;
  padding: 64px 0 56px;
}
.hero-label {
  display: inline-block;
  background: rgba(255,255,255,.15);
  border: 1px solid rgba(255,255,255,.25);
  border-radius: 999px;
  padding: 4px 14px;
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .05em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 16px;
  max-width: 600px;
}
.hero-sub {
  font-size: 1.0625rem;
  opacity: .9;
  max-width: 520px;
  margin-bottom: 28px;
  line-height: 1.6;
}
.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: .875rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background var(--transition), border var(--transition), color var(--transition), box-shadow var(--transition);
  text-decoration: none;
  line-height: 1.25;
}
.btn:hover { text-decoration: none; }
.btn:focus-visible {
  outline: 3px solid var(--indigo-300);
  outline-offset: 2px;
}
.btn-primary {
  background: #fff;
  color: var(--indigo-700);
  border-color: #fff;
  box-shadow: var(--shadow-md);
}
.btn-primary:hover { background: var(--indigo-50); }
.btn-ghost {
  background: transparent;
  color: inherit;
  border-color: rgba(255,255,255,.35);
}
.btn-ghost:hover { background: rgba(255,255,255,.12); }
.btn-sm {
  padding: 6px 14px;
  font-size: .8125rem;
}
.btn:disabled {
  opacity: .45;
  cursor: not-allowed;
}

body .btn-ghost.btn-indigo {
  color: var(--indigo-600);
  border-color: var(--indigo-200);
  background: #fff;
}
body .btn-ghost.btn-indigo:hover {
  background: var(--indigo-50);
  border-color: var(--indigo-300);
}

/* ===== Splitter Panel ===== */
.splitter-panel {
  padding: 48px 0 56px;
}
.splitter-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}
.splitter-inputs h2,
.splitter-output h2 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 12px;
}

.field-label {
  display: block;
  font-size: .8125rem;
  font-weight: 600;
  color: var(--gray-600);
  margin-bottom: 6px;
}

.card-textarea {
  width: 100%;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: .8125rem;
  line-height: 1.55;
  color: var(--gray-800);
  background: #fff;
  resize: vertical;
  min-height: 280px;
  transition: border var(--transition), box-shadow var(--transition);
}
.card-textarea:focus {
  outline: none;
  border-color: var(--indigo-400);
  box-shadow: 0 0 0 3px rgba(99,102,241,.15);
}
.card-textarea::placeholder { color: var(--gray-400); }

.hint {
  font-size: .75rem;
  color: var(--gray-500);
  margin-top: 6px;
}

.input-actions {
  display: flex;
  gap: 8px;
  margin-top: 10px;
}

/* Split controls */
.split-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 20px;
  padding: 18px;
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
}
.control-group { min-width: 0; }
.select-input {
  width: 100%;
  padding: 8px 12px;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: .8125rem;
  color: var(--gray-800);
  background: #fff;
  cursor: pointer;
  transition: border var(--transition);
}
.select-input:focus {
  outline: none;
  border-color: var(--indigo-400);
  box-shadow: 0 0 0 3px rgba(99,102,241,.15);
}

.range-row {
  display: flex;
  align-items: center;
  gap: 12px;
}
.range-input {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  background: var(--gray-200);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}
.range-input::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--indigo-600);
  border: 2px solid #fff;
  box-shadow: 0 1px 3px rgba(0,0,0,.2);
  cursor: pointer;
}
.range-input::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--indigo-600);
  border: 2px solid #fff;
  box-shadow: 0 1px 3px rgba(0,0,0,.2);
  cursor: pointer;
}
.range-output {
  font-size: .875rem;
  font-weight: 700;
  color: var(--indigo-700);
  min-width: 28px;
  text-align: center;
}

.hidden { display: none !important; }

/* Output panel */
.splitter-output {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  min-height: 400px;
}
.output-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--gray-200);
  flex-wrap: wrap;
  gap: 8px;
}
.output-actions {
  display: flex;
  gap: 6px;
}

.batch-result {
  flex: 1;
  padding: 20px;
  overflow-y: auto;
  max-height: 520px;
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 20px;
  color: var(--gray-500);
}
.empty-icon { margin-bottom: 12px; }
.empty-title { font-weight: 600; color: var(--gray-700); margin-bottom: 4px; }
.empty-text { font-size: .8125rem; max-width: 280px; }

.batch-card {
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  overflow: hidden;
}
.batch-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--indigo-50);
  border-bottom: 1px solid var(--indigo-100);
}
.batch-card-header h3 {
  font-size: .8125rem;
  font-weight: 700;
  color: var(--indigo-800);
}
.batch-card-header .batch-meta {
  font-size: .75rem;
  color: var(--indigo-400);
  font-weight: 500;
}
.batch-card-body {
  padding: 12px 16px;
}
.batch-card-body ol {
  padding-left: 20px;
}
.batch-card-body li {
  font-size: .8125rem;
  color: var(--gray-700);
  line-height: 1.6;
  margin-bottom: 2px;
}
.batch-card-body .no-cards {
  font-size: .8125rem;
  color: var(--gray-400);
  font-style: italic;
}

.batch-stats {
  display: flex;
  gap: 8px;
  padding: 12px 20px;
  border-top: 1px solid var(--gray-200);
  flex-wrap: wrap;
}
.stat-chip {
  display: inline-block;
  font-size: .75rem;
  font-weight: 600;
  background: var(--gray-100);
  color: var(--gray-700);
  padding: 4px 10px;
  border-radius: 999px;
}

/* ===== Examples Panel ===== */
.examples-panel {
  padding: 48px 0 56px;
  background: #fff;
  border-top: 1px solid var(--gray-200);
}
.examples-panel h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 24px;
}
.example-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.example-card {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  padding: 20px;
}
.example-card h3 {
  font-size: .9375rem;
  font-weight: 700;
  color: var(--gray-800);
  margin-bottom: 12px;
}
.example-list {
  padding-left: 20px;
}
.example-list li {
  font-size: .8125rem;
  color: var(--gray-600);
  line-height: 1.7;
}
.example-output { display: flex; flex-direction: column; gap: 12px; }
.example-batch {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
}
.example-batch strong {
  font-size: .8125rem;
  color: var(--indigo-700);
  display: block;
  margin-bottom: 6px;
}
.example-batch ol { padding-left: 18px; }
.example-batch li { font-size: .75rem; color: var(--gray-600); line-height: 1.6; }
.example-note {
  font-size: .75rem;
  color: var(--gray-500);
  margin-top: 4px;
}

/* ===== Guide Panel ===== */
.guide-panel {
  padding: 48px 0 56px;
}
.guide-panel > .container > h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 24px;
}
.guide-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 32px;
}
.guide-block {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  padding: 20px;
}
.guide-block h3 {
  font-size: .9375rem;
  font-weight: 700;
  color: var(--gray-800);
  margin-bottom: 8px;
}
.guide-block p {
  font-size: .875rem;
  color: var(--gray-600);
  line-height: 1.65;
}
.guide-block code {
  background: var(--indigo-50);
  color: var(--indigo-700);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: .8125rem;
}

.guide-details {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.guide-subsection {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  padding: 20px;
}
.guide-subsection h3 {
  font-size: .9375rem;
  font-weight: 700;
  color: var(--gray-800);
  margin-bottom: 10px;
}
.guide-subsection p,
.guide-subsection li {
  font-size: .875rem;
  color: var(--gray-600);
  line-height: 1.65;
}
.guide-subsection ul { padding-left: 18px; }
.guide-subsection li { margin-bottom: 6px; }
.guide-subsection li strong { color: var(--gray-700); }

/* ===== FAQ Panel ===== */
.faq-panel {
  padding: 48px 0 56px;
  background: #fff;
  border-top: 1px solid var(--gray-200);
}
.faq-panel h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 24px;
}
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.faq-item {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  padding: 18px 20px;
}
.faq-item dt {
  font-size: .9375rem;
  font-weight: 700;
  color: var(--gray-800);
  margin-bottom: 6px;
}
.faq-item dd {
  font-size: .875rem;
  color: var(--gray-600);
  line-height: 1.65;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--gray-900);
  color: var(--gray-400);
  padding: 40px 0 24px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 32px;
}
.footer-logo {
  font-weight: 700;
  color: #fff;
  font-size: .9375rem;
}
.footer-desc {
  font-size: .8125rem;
  line-height: 1.6;
  margin-top: 8px;
  max-width: 320px;
}
.footer-heading {
  display: block;
  font-size: .75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--gray-300);
  margin-bottom: 10px;
}
.footer-links a {
  display: block;
  font-size: .8125rem;
  color: var(--gray-400);
  padding: 3px 0;
}
.footer-links a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding-top: 16px;
  font-size: .75rem;
  text-align: center;
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--gray-900);
  color: #fff;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-size: .8125rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  z-index: 200;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity .25s ease, transform .25s ease;
  pointer-events: none;
}
.toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Print ===== */
@media print {
  .site-header,
  .hero,
  .splitter-panel,
  .examples-panel,
  .guide-panel,
  .faq-panel,
  .site-footer,
  .output-actions,
  .input-actions,
  .split-controls,
  .card-textarea,
  .toast,
  .skip-link,
  [id^="AD"],
  [class*="ad"] {
    display: none !important;
  }
  body { background: #fff; color: #000; }
  .splitter-output {
    border: none;
    box-shadow: none;
    display: block;
  }
  .batch-result {
    max-height: none;
    overflow: visible;
  }
  .batch-card { break-inside: avoid; border-color: #ccc; }
  .batch-card-header { background: #f3f4f6; border-color: #ddd; }
  .batch-stats { border-color: #ddd; }
  .stat-chip { background: #f3f4f6; color: #333; }
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .splitter-layout {
    grid-template-columns: 1fr;
  }
  .example-grid {
    grid-template-columns: 1fr;
  }
  .guide-grid {
    grid-template-columns: 1fr;
  }
  .guide-details {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .container { padding: 0 14px; }
  .hero { padding: 40px 0 36px; }
  .hero h1 { font-size: 1.5rem; }
  .header-inner { height: 48px; }
  .logo-text { display: none; }
  .main-nav a { padding: 4px 8px; font-size: .8125rem; }
  .split-controls { grid-template-columns: 1fr; }
  .output-header { flex-direction: column; align-items: flex-start; }
  .footer-grid { grid-template-columns: 1fr; gap: 20px; }
  .batch-result { padding: 14px; }
  .faq-item { padding: 14px 16px; }
  .guide-block, .guide-subsection, .example-card { padding: 16px; }
}


/* Factory-injected deployment helpers. The AI owns the site design above this block. */
.ad-unit {
  width: min(100%, 720px);
  min-height: 120px;
  margin: 24px auto;
  display: block;
}

.legal-page {
  width: min(900px, calc(100% - 32px));
  margin: 40px auto;
}

.factory-fallback-nav {
  width: min(900px, calc(100% - 32px));
  margin: 24px auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  font-size: 0.95rem;
}

.factory-fallback-nav a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}